使用 UnevenRows 更新 TableView 中的 ViewCell 无法正常工作 Xamarin.Forms

Question

Fill the TableView with so many ViewCells, so you must scroll the page to see the last ViewCell. If you then update the last ViewCell (change the text of the label) over the Tapped-Event, the label.Text would not be updated..

PS: The ForceUpdateSize is no way the fix the solution, because on iOS the app freeze at the sixth time.

<TableView Intent="Settings" HasUnevenRows="True">
    <TableRoot>
        <TableSection>
            <ViewCell x:Name="DefaultViewCell" Tapped="ItemTapped">
                 <StackLayout>
                    <Label x:Name="DefaultLabel" />
                 </StackLayout>
            </ViewCell>
                      <!--.....-->
        </TableSection>
     </TableRoot>
</TableView>

Answer 1

I have tested your sample code , it actually happened the phenomenon your describe. Although it not happens in Android ,however it occurs in IOS . Maybe there are something difference about Label between IOS anf Android.

Finally , I found a solution in IOS. You can set a default Text Value to Label ,then Tapped method can work .

As Follow:

<TableView Intent="Settings" HasUnevenRows="True" BackgroundColor="Accent" >
    <TableRoot>
        <TableSection>
            <ViewCell x:Name="DefaultViewCell" Tapped="DefaultViewCell_Tapped">
                <StackLayout>
                    <Label x:Name="DefaultLabel" Text="Default Text "/>
                </StackLayout>
            </ViewCell>
            ...
        </TableSection>
    </TableRoot>
</TableView>